Department of the Environment and Water Resources home page

About us | Contact us | Publications | What's new

Header imagesHeader imagesHeader images

Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Pyxine cognata Stirt.

Proc. Roy. Philos. Soc. Glasgow 11: 311 (1879).

T: Nilgherries [Nilgiri], India, A.Watt s.n.; holo: BM.

Pyxine berteriana var. himalaica D.D.Awasthi, Phytomorphology 30: 366 (1982). T: Almora district, on way to Kasardevi, Uttar Pradesh, India, c. 1930 m, on bark, 12 June 1956, D.D.Awasthi 3476; holo: n.v.

  Thallus 2–6 cm wide, adnate to tightly adnate, subdichotomously lobate. Lobes radiating, discrete to ±contiguous, plane to slightly concave, in older thalli becoming slightly convex in the centre, 0.3–1.0 mm wide, subrotund to truncate at the apices. Upper surface white to whitish grey or grey-brown, pruinose in extended patches near the apices, the pruina ±glistening; dactyls, isidia and soredia absent. Pseudocyphellae not prominent, usually retricted to the margins, rarely laminal or becoming subreticulate, often obscured by spreading pruina. Medulla orange in upper part; lower medulla white. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, obscurascens-type, 0.3–1.0 mm wide; disc epruinose. Internal stipe distinct; upper part orange-red, K+ purple, P–; lower part much paler or white, K–, P–. Ascospores 13–20 × 6–7 μm. Pycnidia not seen.
CHEMISTRY: Cortex K–, UV+ yellow; medulla K– or K+ pale red, C–, KC–, P– or P+ orange; containing lichexanthone (major), triterpenes (major or minor), unknown pigment (minor or trace).
  Rare on bark in hinterland forest in south-eastern Qld. Also in Asia and South America.  
  Elix (2009l)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Australian Biological Resources Study. Requests and inquiries concerning reproduction and rights should be addressed in the first instance to Dr P. McCarthy. These pages may not be displayed on, or downloaded to, any other server without the express permission of ABRS.

Top | About us | Advanced search | Contact us | Information services | Publications | Site index | What's new